I found the react-navigation a very good library for not only for navigation between screens but also by providing with other marvelous features.

But, I feel that a few portions of the library need to be made flexible as per developers choice.

Like providing a customizable borderColors for headers.

For reference you check the line number:356 in the below link.

https://github.com/react-navigation/react-navigation/blob/master/src/views/Header/Header.js

I think if such things can be customizable by passing the the colors through props that would be great.

Thanks.